Documentation of atmospheric constants over Niamey, Niger: a theoretical aid for measuring instruments

Emetere, Moses and Akinyemi, M. L. (2017) Documentation of atmospheric constants over Niamey, Niger: a theoretical aid for measuring instruments. METEOROLOGICAL APPLICATIONS. pp. 260-267.

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Abstract

The frequent failures of ground measuring devices, e.g. radiosondes, weather stations, in developing regions is worrisome. From the literature, established projects such as the Aerosol Robotic Network (AERONET) and the African Monsoon Multidisciplinary Analyses (AMMA) are burdened by the same challenge. At the moment, the AERONET and AMMA databases show a large volume of data loss. With only about 47% of data available to scientists, it is evident that accurate nowcasts or forecasts cannot be guaranteed. It is proposed that the challenge is not measuring device design error but systemic, i.e. the configuration of accurate calibration constants in the compact flash card of the devices. The calibration constants of most radiosonde or weather stations are not compatible with the atmospheric conditions of the West African climate. A dispersion model was developed to incorporate salient mathematical representations such as the unified number. The unified number was derived to describe the turbulence of aerosol transport in the frictional layer of the lower atmosphere. A 14 year dataset from theMulti-angle Imaging Spectro Radiometer was tested using the dispersionmodel. A yearly estimation of the atmospheric constants over Niamey using the model was obtained with about 87.5% accuracy. This further revealed that the average atmospheric constants for Niamey, Niger, are a1 =0.77975 and a2 =0.693021 and the tuning constants are n1 =0.140187 and n2 =0.759236. Also, the yearly atmospheric constants confirmed that the lower atmosphere of Niamey is very dynamic. Hence, it is recommended that radiosonde and weather station manufacturers should constantly review the atmospheric constants over a geographical location to enable about 80% data retrieval.

Item Type:	Article
Uncontrolled Keywords:	atmospheric constant; dispersion model; unified number; aerosol; Niamey
Subjects:	Q Science > Q Science (General) Q Science > QC Physics
Divisions:	Faculty of Engineering, Science and Mathematics > School of Physics
Depositing User:	Mrs Hannah Akinwumi
Date Deposited:	19 Oct 2018 08:14
Last Modified:	19 Oct 2018 08:14
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/12007

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